3// The Webcaster GunPerfect for: Achieving an instant unlived-in look. Geek factor: Some people have time to drape cobwebs meticulously across rafters and door frames. If you’ve got access to an air compressor, you can use this glue-gun-style weapon to make undecorating more efficient by shooting “professional looking” spider silk. $50

4// Real White Hanging Black Light GhostPerfect for: Steering traffic toward your haunted mansion. Geek factor: Set it under a black light and this ghostly white apparition can be seen from more than 100 yards away. An Eyes Without a Face-style mask and an adjustable 4-foot arm span greet and direct revelers. The graveyard? Why, this way, please… $80, www.kentuckyspecialfx.com